单项选择题

He asked who was the man ______.

A．being operated on
B．operating on
C．operate on
D．operates on
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单项选择题
They talked as if they ______ friends for years.
A．were
B．have been
C．would be
D．had been
单项选择题
There are few places in this country ______ wheat can't grow well.
A．where
B．which
C．when
D．if
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